| Abstract:The paper is aimed at designing a multilayer long-span gymnasium and study the feasibility of hollow-slab long-span multilayer structure the structure.Firstly, the article is going to introduce the basic theory in designing hollow-core slab. Giving a brief outlines of mechanical characteristics of insular design method of hollow-core slab structure, and state the difference of plate-floor style and beam-floor style. Explain the limitations that using the equivalent beam method for calculating the hollow-core slab structure by analysis the mechanical characteristics of plate-floor both in vertical and lateral loads. Then introduce the design principles of column caps, dark beams, girders in hollow-core slab.Conducting the parametric analysis of the structure through the STRAT modeling analysis, the article obtain the following conclusions based on large-span hollow-core structure:(1) The plate-floor style hollow-core slab has insular area properties, using the equivalent beam method for analysis has obvious limitations, the paper suggests beam-slab Collaborative analysis.(2) The paper suggests the high span ratio of long-span hollow-core slab structure is1/30-1/35(high span ratio:plate thickness/the short span length). Continue to increase the ratio has small influence on reducing the deflection of slab.(3) The paper suggests the volume rate of long-span hollow-core slab is50%-60%. The high rate of hollow will weaken the section too much. Not only the deflection of the plate will rise, but also the shear reinforcement of slab will rise.(4) The column cap size of long-span structure has large influence on shear reinforcement. Strengthening the column cap size on purpose can significantly reduce the flexural reinforcement of slab. When the column cap size reach to1/3of column span, the shear reinforcement of slab will meet the requirements. When the size exceed1/3of the column span, continue to increase the size of the column cap has little influence on shear reinforcement.Finally, the paper conduct the overrun analysis of the structure, such as axial compression ratio overrun, column joint shear overrun, torsional overrun of side beam. The paper recommends side beam torsion reduction factor of0.4. |
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